Haynes? that's their problem, their editors don't know about this forum!!!!!LOL

I don't have a Haynes so I can't compare but its probably the same thing they just use non-MB speak!!

You can just follow the directions and check the piston diaphram in about 5 min., if its failed you can get the monovalve repair kit ordered from Fastlane and have it in a couple of days, another 10 minutes and your good as new. Good luck!